/*
XPTracker - Alternative Agile Tracking Tool
Copyright (C) 2006-2009  Stephen Starkey

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
*/
package org.xptracker.web;

import com.google.inject.Inject;
import org.xptracker.domain.Domain;
import org.xptracker.domain.User;
import org.xptracker.domain.UserAccessor;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class RefreshingUser implements InvocationHandler {
  @SuppressWarnings({"UnusedDeclaration"})
  @Inject
  private Domain domain;

  private String userId;
  private transient User user;

  public RefreshingUser(String userId) {
    this.userId = userId;
  }

  public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
    if (user == null) {
      user = domain.fetchUser(userId);
    }
    return method.invoke(user, args);
  }

  public static UserAccessor makeAccessor(RefreshingUser refreshingUser) {
    return (UserAccessor) Proxy.newProxyInstance(RefreshingUser.class.getClassLoader(), new Class[] {UserAccessor.class},
        refreshingUser);
  }
}
